swarm: bootnode-mode, new bootnodes and no p2p package discovery (#18498)

(cherry picked from commit bbd120354a)

swarm/network/protocol.go

@@ -67,6 +67,7 @@ type BzzConfig struct {
 	HiveParams   *HiveParams
 	NetworkID    uint64
 	LightNode    bool
+	BootnodeMode bool
 }
 
 // Bzz is the swarm protocol bundle
@@ -87,7 +88,7 @@ type Bzz struct {
 // * overlay driver
 // * peer store
 func NewBzz(config *BzzConfig, kad *Kademlia, store state.Store, streamerSpec *protocols.Spec, streamerRun func(*BzzPeer) error) *Bzz {
-	return &Bzz{
+	bzz := &Bzz{
 		Hive:         NewHive(config.HiveParams, kad, store),
 		NetworkID:    config.NetworkID,
 		LightNode:    config.LightNode,
@@ -96,6 +97,13 @@ func NewBzz(config *BzzConfig, kad *Kademlia, store state.Store, streamerSpec *p
 		streamerRun:  streamerRun,
 		streamerSpec: streamerSpec,
 	}
+
+	if config.BootnodeMode {
+		bzz.streamerRun = nil
+		bzz.streamerSpec = nil
+	}
+
+	return bzz
 }
 
 // UpdateLocalAddr updates underlayaddress of the running node